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Security Advisories: GSA_kwCzR0hTQS1tOGNnLXhjMnAtcjNmY84AAydr
rootless: `/sys/fs/cgroup` is writable when cgroupns isn't unshared in runc
Impact
It was found that rootless runc makes /sys/fs/cgroup
writable in following conditons:
- when runc is executed inside the user namespace, and the
config.json
does not specify the cgroup namespace to be unshared (e.g..,(docker|podman|nerdctl) run --cgroupns=host
, with Rootless Docker/Podman/nerdctl) - or, when runc is executed outside the user namespace, and
/sys
is mounted withrbind, ro
(e.g.,runc spec --rootless
; this condition is very rare)
A container may gain the write access to user-owned cgroup hierarchy /sys/fs/cgroup/user.slice/...
on the host .
Other users's cgroup hierarchies are not affected.
Patches
v1.1.5 (planned)
Workarounds
- Condition 1: Unshare the cgroup namespace (
(docker|podman|nerdctl) run --cgroupns=private)
. This is the default behavior of Docker/Podman/nerdctl on cgroup v2 hosts. - Condition 2 (very rare): add
/sys/fs/cgroup
tomaskedPaths
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1tOGNnLXhjMnAtcjNmY84AAydr
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: over 1 year ago
Updated: over 1 year ago
CVSS Score: 2.5
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:L
Identifiers: GHSA-m8cg-xc2p-r3fc, CVE-2023-25809
References:
- https://github.com/opencontainers/runc/security/advisories/GHSA-m8cg-xc2p-r3fc
- https://nvd.nist.gov/vuln/detail/CVE-2023-25809
- https://github.com/opencontainers/runc/commit/0d62b950e60f6980b54fe3bafd9a9c608dc1df17
- https://github.com/advisories/GHSA-m8cg-xc2p-r3fc
Blast Radius: 11.1
Affected Packages
go:github.com/opencontainers/runc
Dependent packages: 7,425Dependent repositories: 27,022
Downloads:
Affected Version Ranges: < 1.1.5
Fixed in: 1.1.5
All affected versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.7, 0.0.8, 0.0.9, 0.1.0, 0.1.1, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4
All unaffected versions: 1.1.5, 1.1.6, 1.1.7, 1.1.8, 1.1.9, 1.1.10, 1.1.11, 1.1.12, 1.1.13, 1.1.14, 1.1.15, 1.2.0, 1.2.1, 1.2.2